You need to check the status of Host Integrity (HI) in registry.
For Symantec Endpoint Protection (SEP) clients older than 14.3 RU5, the registry value "HIEngineResult" allows you to see the current state of the host integrity check.
In SEP 14.3 RU5 and later, even if the system is a 64-bit OS, you can check the same registry under HKEY_LOCAL_MACHINE\Software\Symantec\Symantec Endpoint Protection\SMC.